How to convert IEnumerable of KeyValuePair<x, y> to Dictionary?

.ToDictionary(kvp=>kvp.Key,kvp=>kvp.Value);

Isn't that much more work.

You can create your own extension method that would perform as you expect.

public static class KeyValuePairEnumerableExtensions
{
    public static Dictionary<TKey, TValue> ToDictionary<TKey, TValue>(this IEnumerable<KeyValuePair<TKey, TValue>> source)
    {
        return source.ToDictionary(item => item.Key, item => item.Value);
    }
}